Question: Who was the inventor of the B-tree, who was awarded the Officer's Cross of the Order of Merit of the Federal Republic of Germany?
Paraphrase: What German inventor came up with the B-tree and awarded the Officer's Cross of the Order of Merit?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q677051 wdt:P61 ?answer . ?answer wdt:P166 wd:Q10905334}
Answer: Rudolf Bayer